Accurate Vibrational and Ro Vibrational Contributions to the Properties of Large Molecules by a New Engine Employing Curvilinear Internal Coordinates and Vibrational Perturbation Theory to Second Order Journal of Chemical Theory and NMR Info Data Hans Reich Collection OrganicChemistryData.org Vibration Rotation Interaction Constant an overview ScienceDirect Topics Rotational Vibrational Coupling Extension of the Karplus Relationship for NMR Spin Spin Coupling Constants to Nonplanar Ring Systems: Pseudorotation of Tetrahydrofuran Rotational Spectra of Rigid Rotor Molecules